题目内容
横、直拉杆弯曲后会导致转向失灵。（ ）
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球头销磨损后转向盘自由行程间隙会变小。（）
Product presentation is not important before customers show interested in product.
If customers have expressed their need for your product, there is no need to introduce the product anymore.
If necessary, let the customers use the new product personally.
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